Sifter



K. M. DoKoFF.

SIFTER.

APPLICATION FILED .IULY 20| I92I.

- Patented 1200.121922;

2 SHEETS-SHEET 2- alleman m Frm i me: time fra 21, 'li di im; te'

.it l.. hasta@ SIFTER.

Application lecl July 20,

oughly agitatefthe material passing thereover so that the valuable material -vill be readily separated from the particles ot no substantial value. yThe invention `seeks to provide a screen which `Will be so mounted that it may have a pivotal motion in trans-4 verse planes and will be provided with means whereby the materia-l passing over 'the inclined surface oit the plane 1will be deiiected troni side to side so that the entire volume oit theniaterial will be caused `to roll or flow over the surface of `the screen to eil feet the desired separation ot the particles.

The invention is illustrated in the acco1npanying drawings and will be hereinafter fully set forth.

ln the dravvingsu Figure l is a perspective view of a sitter embodying my invention; i

Fig. 2 is a longitudinal section thereo; Fig. 3 is a transverse section on the line ln carrying out the invention, l. employ a supporting frame l which may be of any substantial construction and is provided at one end With vertical extensions 2 connect e ed at their upper ends by a cross bar 3, inclined braces extending from the said cross bar or the upper ends of the extensions to the side bars oit the traine so as to provide a rigid structure. Vilear plates 5 are secured upon the upper ends ot the braces l for a purpose which will presently appear. `Upon the upper cross bar 3 and the cross bar the rear or loiver end oli the frame, l secure journal boxes 7 in which are journaled the pivot pins or studs 8 `extending from the adjacent ends or' the screen. The screen coin prises iinpertor te side plates 9 and a per itoiated plate or screen proper 1G secured to lirferring particularly to y vided through the deector and i921. serial no. 4ssen.`

and extending between the lower edges of' said side plates. The screen l0 terminates short-.of the upper or rear ends of the side plates and the said rear ends of the side plates are connected at their lower edges by an imperiiorate plate ll upon which the material to be screened is deposited. By re- Fig. 2, it Will be noted that this plate ll is inclined relative to thefpert'orated plate l0 so that the material deposited on said feed plate l1 will at ence gravitate over the sanie onto the screen. At the center of the feed plate ll on the upper side thereoi is secured a V-shaped'de- Hector l2 whereby the material deposited upon the feed plate will be directed toward the sides of the screen and ivill bethereby prevented from lioiving onto the centerthere off in a compact mass. Openings 13 are proa portion of the liner @particles of the material may pass through these openings onto the central portion of the screen so that the material will be el'liectually spread over the upper end oft the screen. inwardly projecting tlangesll are provided along the lower edges of theside plates so as to reinforce the same and the side edges of thev screen properare secured to the under sides of these flanges by angle bars l5 which serveito reinforce the sidesofthe structure `and lirnil clama the side edges ot' the screen plate in position and prevent buckling of the same. To the upper end olf the iced plate ll. and across'the-undei' side thereof, ll secure an angle bar l which reinforces said plate and prevents buckling thereotso that the saidk plate'ivill be maintained in a proper iiat condition to re ceive and deposit the `material, a similar angle bar if? being secured across the under side @if the screen at the loiver vedge of the feed plate, as shown inost clearly in Fig. 2,and the upper pivot S being secured to and carried b v the said angle bar 17, as shoivn. lo the ends' et the transverse angle bar l?, I cure bumpers 18 which are adapted to impinge upon the `Wear plates 5 as the screen oscillated so as to limit the oscillatory -niovements and also iai' the screen so that the contents of the saine *.vill be shaken and the particles loosened so that the separation cured across the the front ends of the side plates 9 in the as shown.

'A screen and transversely thereto, I

proper spaced relation and to reinforce the structure, an angle bar 23 is secured to ,the same and the ends of the said angle bar are extended downwardly so as to be connected with the angle bar 19 and the bumpers 20. The lower pivot 8y is carriedy by the angle bar 23 and is providedwith a stop flange 2d to abut the bearing and preventthe screen riding downwardly upon the main frame. The space below the angle bar 23 is open to permit discharge of the cleaned material. and a chute or discharge spout 25 pro jects from the front lower end of the screen, A. longitudinal brace rod 26 is eatended between `and carried by the angle bars 17 and 19 `centrally of the screen and bearsagainst the under side of the lscreen plate 10 so` as to prevent sagging of the same, and on the upper side of the said screen plate, equi-distant from the sides thereof, l provide asupplemental screen plate 27 which is of a slightly arched form, as shown. Secured to the side plates 9 and the flanges 1d, at the lower edges thereof, are upper and lower deflectors 28 and 29 which project in- `n'lfardly and downwardly from the side plates so that the material falling against the same in theoperation of the screen will be turned toward the center and prevented from accumulatingat the sides `of the apparatus.

Upon the supporting journal a a band pulley 31 at shaft 30 equipped with may be applied from one end to which power any convenient motor. At the inner sides of the frame,l secure upon the shaft 30 cams or tappets 33which are disposed in the vertical planes of the sides of the screen proper and have their high parts extended in diametrically opposite directions, buffers 34:

vbeing secured to the under side of the. screen immediately over to receive the impact of the same.

the said tappets or cams These buffers may conveniently be resilient plates secured at their ends to the screen or the angle irons 15 and having their intermediate j portions free and b-owed, as clearly shown.

Means may be provided to take up slack in the screen. l have illustrated a bolt 35 mounted in lugs on the under side of the screen and transversely thereof. By tightening these bolts slack will be overcome by causing the screen to buckle below the supplemental screen 27.

adapted to impinge againstV frame below thev The operation of the apparatus will, it is thought, be readily understood. The material to `be screened is deposited upon the feed plate 11 and will pass downwardly over the same onto the screen plate 10, being spread by the action of the deflector 12 in an obvious manner with some of the finer particles passing through the space between the upper end of the screen plate 'l0 and the upper end of the arched secondary screen plate 27. lThe driving gear wheel 32 is then rotated and motion will be consequently imparted to the shaft 30 so that the tappets or cams 33 willfstrike against the bottom of the screen alternatelyand in rapid succession thereby rocking the screen upon the pivots 8 sothatthe material will be thrown alternately from side to side as it flows down the inclined surface. The transverse vibration of the screen will obviously prevent the material accumulating alongk the sides and the deiectors 28 and 29 willserve to deflect toward the centerof thescreen those portions of the material at the sides thereof which might otherwise tend to travel in straight lines longitudinally of thescreen. rthe material thrown toward the center of the screen will, of course, strike upon the upper convex surface of the secondary screen l27 and this impact will aid in agitatingthe material so'that the separation of the'particles will be thoroughly accomplished. The less valuable or waste matters pass through the openings inthe screen plates and may be permitted to accumulate upon theground below the screen, while the more valuable matter will pass over the chute or discharge spout 25 into any convenient receptacle placed below the same. V

It will be readily noted that my screen isV very simple in theiconstruction and arrangement of its parts and may be set up for use at a very low cost. A large quantity of material may be treated in a short period of time under very low powery and a very thorough agitation and separation of the various particles will be rapidly accomLv plished. l/Vhile l have'shown and describedr a single screen plate, it is obvious that the screens may be multiplied without anymaterial change in construction, the height of the side plates being determined by the number of screens to be used.

Having thus described the invention,what is claimed'as new is: i

1. The combination of a supporting frame, an inclined screen disposed longitudinally of the same,v bearings on the frame at the ends thereof, a pivot stud projecting longitudinally from. the-bottom of the screen near the upper end thereof and fitted in a bearing at the upper end of the frame, a second pivot stud projectingfrom the upper edge of the screen at the lower end thereof and engaged in a bearing on the adjacent end of upon the rst-mentoned screen plate at the center thereof and extending from end to l0 end `thereof with its edges spaced from the side plates. l

In testimony whereof l ture.

@Elx my signa- KALLY M. nonom. [L 5.] 

